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प्रश्न
Differentiate between the following:
Monohybrid and Dihybrid
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उत्तर
| Sr. No. | Monohybrid | Dihybrid |
| 1. | A cross between two pure organisms is used to explore the inheritance of a specific pair of alleles. | A cross between two pure organisms of the same species is used to explore the inheritance of allele pairs. |
| 2. | The F2 generation produces a phenotypic monohybrid ratio of 3 : 1. | The F2 generation produces a phenotypic dihybrid ratio of 9 : 3 : 3 : 1. |
| 3. | It generates a genotypic ratio of 1 : 2 : 1 in F2. | It produces a genotypic ratio of 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1 in F2. |
| 4. | For example, the cross between tall and dwarf pea plants is a monohybrid cross. | For example, the cross between pea plants having yellow, wrinkled seeds with those having green, round seeds is a dihybrid cross. |
संबंधित प्रश्न
When a cross is made between tall plant with yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be:
- Tall and green.
- Dwarf and green.
How would you find out whether a given tall garden pea plant is homozygous or heterzygous? Substantiate your answer with the help fo Punnett squares.
Given below are the F2 – phenotypic ratios of two independently carried monohybrid crosses :
(i) 1 : 2 : 1
(ii) 3 : 1
Mention what does each ratio suggest.
A certain couple got four daughters in a sequence and no son. Does it mean that the husband does not produce Y-chromosome bearing sperms? Explain. What is the chance of this couple having a daughter?
Differentiate Between Monohybrid and Dihybrid cross.
A garden pea plant produces axial white flowers. Another of the same species produced terminal violet flowers. Identify the dominant trait?
What do you understand by the terms phenotype and genotype?
A pure tall plant (TT) is crossed with the pure dwarf plant (tt), what would be the F1 and F2 generations? Explain.
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
What is the ratio of tall plants to dwarf plants in the F2 generation?
Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the F1 generation are then selfed to produce F2 generation of pea plants.
Which type of plants was missing in the F1 generation but reappeared in the F2 generation?
A Monohybrid cross is ______
In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?
In a cross between red coloured and white coloured flowers, when plants with red coloured flowers of F1 generation were self pollinated, plants of F2 generation were obtained in which 75% of plants were with red flowers and 2.5% plants were with white flowers.
Explain the inheritance of traits in the above cross with the help of a flow chart only along with the ratio of plants obtained.
Monohybrid crosses are useful in demonstrating which of the following laws of inheritance suggested by Mendel?
A monohybrid cross is a genetic cross in which how many pair(s) of contrasting characters is/are studied?
What are the phenotype and genotype of all offspring produced by \[TT \times tt\]?
In the first filial generation, what is the observation for the cross \[TT \times tt\]?
Which self-pollination is performed to obtain the F2 generation?
Which gametes are produced by each \[Tt\] plant during selfing in F1?
What are the four genotypic outcomes of the cross \[Tt \times Tt\]?
What is the phenotypic ratio in F2?
What is the genotypic ratio in F2?
